Text of 6,297,751 Patent (October 2, 2001)
Yet another controller-related patent suit is being brought against the three major console makers. This time over a patent covering a “Low-Voltage Joystiq Port Interface”. The abstract reads:
The joystick port interface includes an integrated circuit receiving an analog joystick position measurement signal and outputting a digital pulse signal to a processor which signifies a joystick coordinate value. The integrated circuit includes a pulse generator and a bidirectional buffer circuit. The bidirectional buffer circuit receives the analog joystick position measurement signal and selectively discharges an RC network capacitor which provides this analog measurement. This implementation provides a joystick port which uses low-voltage CMOS VLSI structures which can interface a conventional high-voltage joystick with the processor.
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